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54 3 54 4 54 5 54 6 54 7 54 8 54 9 55 0 55 1 55 2 55 3 1891 1890 1889 1888 1887 1886 1885 1884 1883 1882

= Free Coordinate    = Occupied(Single Region)     = Occupied (Var Region)     = Center of the grid